/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.tsfile.read.common.block.column;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.utils.TsPrimitiveType;
import org.openjdk.jol.info.ClassLayout;

import java.util.Arrays;
import java.util.Optional;

import static io.airlift.slice.SizeOf.sizeOf;
import static org.apache.iotdb.tsfile.read.common.block.column.ColumnUtil.checkValidRegion;

public class BooleanColumn implements Column {

    private static final int INSTANCE_SIZE =
            ClassLayout.parseClass(BooleanColumn.class).instanceSize();
    public static final int SIZE_IN_BYTES_PER_POSITION = Byte.BYTES + Byte.BYTES;

    private final int arrayOffset;
    private final int positionCount;
    private final boolean[] valueIsNull;
    private final boolean[] values;

    private final long retainedSizeInBytes;

    public BooleanColumn(int positionCount, Optional<boolean[]> valueIsNull, boolean[] values) {
        this(0, positionCount, valueIsNull.orElse(null), values);
    }

    BooleanColumn(int arrayOffset, int positionCount, boolean[] valueIsNull, boolean[] values) {
        if (arrayOffset < 0) {
            throw new IllegalArgumentException("arrayOffset is negative");
        }
        this.arrayOffset = arrayOffset;
        if (positionCount < 0) {
            throw new IllegalArgumentException("positionCount is negative");
        }
        this.positionCount = positionCount;

        if (values.length - arrayOffset < positionCount) {
            throw new IllegalArgumentException("values length is less than positionCount");
        }
        this.values = values;

        if (valueIsNull != null && valueIsNull.length - arrayOffset < positionCount) {
            throw new IllegalArgumentException("isNull length is less than positionCount");
        }
        this.valueIsNull = valueIsNull;

        retainedSizeInBytes = (INSTANCE_SIZE + sizeOf(valueIsNull) + sizeOf(values));
    }

    @Override
    public TSDataType getDataType() {
        return TSDataType.BOOLEAN;
    }

    @Override
    public ColumnEncoding getEncoding() {
        return ColumnEncoding.BYTE_ARRAY;
    }

    @Override
    public boolean getBoolean(int position) {
        return values[position + arrayOffset];
    }

    @Override
    public boolean[] getBooleans() {
        return values;
    }

    @Override
    public Object getObject(int position) {
        return getBoolean(position);
    }

    @Override
    public TsPrimitiveType getTsPrimitiveType(int position) {
        return new TsPrimitiveType.TsBoolean(getBoolean(position));
    }

    @Override
    public boolean mayHaveNull() {
        return valueIsNull != null;
    }

    @Override
    public boolean isNull(int position) {
        return valueIsNull != null && valueIsNull[position + arrayOffset];
    }

    @Override
    public boolean[] isNull() {
        if (valueIsNull == null) {
            boolean[] res = new boolean[positionCount];
            Arrays.fill(res, false);
            return res;
        }
        return valueIsNull;
    }

    @Override
    public int getPositionCount() {
        return positionCount;
    }

    @Override
    public long getRetainedSizeInBytes() {
        return retainedSizeInBytes;
    }

    @Override
    public Column getRegion(int positionOffset, int length) {
        checkValidRegion(getPositionCount(), positionOffset, length);
        return new BooleanColumn(positionOffset + arrayOffset, length, valueIsNull, values);
    }

    @Override
    public Column subColumn(int fromIndex) {
        if (fromIndex > positionCount) {
            throw new IllegalArgumentException("fromIndex is not valid");
        }
        return new BooleanColumn(
                arrayOffset + fromIndex, positionCount - fromIndex, valueIsNull, values);
    }

    @Override
    public void reverse() {
        for (int i = arrayOffset, j = arrayOffset + positionCount - 1; i < j; i++, j--) {
            boolean valueTmp = values[i];
            values[i] = values[j];
            values[j] = valueTmp;
        }
        if (valueIsNull != null) {
            for (int i = arrayOffset, j = arrayOffset + positionCount - 1; i < j; i++, j--) {
                boolean isNullTmp = valueIsNull[i];
                valueIsNull[i] = valueIsNull[j];
                valueIsNull[j] = isNullTmp;
            }
        }
    }
}
